I don't think the proofs for the existence of God are heterodox, though perhaps considered unnecessary or unwanted by some Orthodox. Here's a quote:

Quote

"The so-called logical evidence for the existence of God is: the cosmological, theological, psychological, historical, ethical proofs, and many more, which, through the passing of time have been formulated into philosophical rationalism. They cannot, in the Dogmatics of the Orthodox Church, have a value of real evidence because they are based on the principles of the relative, limited, sinful minds and senses of humanity. To the Church and the Revelation, the truth about the existence of God is an illogical and irrational hypothesis, which has the need of proof with the basis of logical reasoning, the truth which God has revealed to us, and is therefore the unquestionable, true evidence. As a divine and given reality, this truth is not dependent on proof and arguments from rational functions of the mind. The logical proof proves God so much more than it hides him." - Justin Popovich, Orthodox Faith and Life in Christ, p. 202

Fwiw, if you haven't seen it yet, there was a thread on Aquinas last year that you might find interesting. Sorry that I can't add more, I've never read that work by him.

The so-called proofs of God's existence are not heteredox, they're simply not "proofs" in the proper sense of the term. The first and foremost reason for this is that God does not exist; He is huper-ousios. I think this is what Justin Popovic has in mind in the quotation given by Asteriktos. This understanding may be complemented by Bishop Kallistos Ware's take on the matter in his The Orthodox Way; notice in particular how he draws a distinction between "pointers" and "evidence".

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No longer an active member of this forum. Sincerest apologies to anyone who has taken offence to anything posted in youthful ignorance or negligence prior to my leaving this forum - October, 2012.

"Philosophy is the imitation by a man of what is better, according to what is possible" - St Severus